Podcast
Questions and Answers
Which observation most strongly suggests that a chemical reaction has occurred between two substances?
Which observation most strongly suggests that a chemical reaction has occurred between two substances?
- A change in temperature when the substances are mixed.
- The formation of a precipitate when two solutions are mixed. (correct)
- The substances mix together and form a solution.
- A change in the state of matter of one of the substances, such as melting.
If mixing two clear solutions results in no observable change, it definitively means that no chemical reaction has occurred.
If mixing two clear solutions results in no observable change, it definitively means that no chemical reaction has occurred.
False (B)
Explain how comparing the properties of substances before and after mixing can help determine if a chemical reaction has taken place.
Explain how comparing the properties of substances before and after mixing can help determine if a chemical reaction has taken place.
Comparing original and final properties allows identifying changes (e.g., color, state, odor), suggesting new substance formation and a chemical reaction. Lack of property change would indicate no reaction.
A chemical reaction is most likely to have occurred if, after mixing two substances, a new ________ with different properties is formed.
A chemical reaction is most likely to have occurred if, after mixing two substances, a new ________ with different properties is formed.
Match each observation with the corresponding conclusion about whether a chemical reaction has occurred:
Match each observation with the corresponding conclusion about whether a chemical reaction has occurred:
When is it least likely that a chemical change has occurred?
When is it least likely that a chemical change has occurred?
Mixing sodium chloride (table salt) with water and observing it dissolve is an example of a chemical reaction.
Mixing sodium chloride (table salt) with water and observing it dissolve is an example of a chemical reaction.
Explain how the presence of a precipitate indicates that the original substances have undergone a chemical change.
Explain how the presence of a precipitate indicates that the original substances have undergone a chemical change.
Mixing acetic acid (vinegar) and sodium bicarbonate (baking soda) results in the production of a ________, which is evidence of a chemical reaction.
Mixing acetic acid (vinegar) and sodium bicarbonate (baking soda) results in the production of a ________, which is evidence of a chemical reaction.
Which of the following observations, when mixing two substances, does NOT suggest a chemical reaction?
Which of the following observations, when mixing two substances, does NOT suggest a chemical reaction?
Flashcards
Chemical Reaction
Chemical Reaction
A process involving the rearrangement of atoms and molecules to form new substances.
Properties of Substances
Properties of Substances
Observations or measurements that describe matter, such as color, state, or temperature.
Analyze and Interpret Data
Analyze and Interpret Data
Using observations and data to identify patterns and draw conclusions.
Evidence of Chemical Reaction
Evidence of Chemical Reaction
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Physical Change
Physical Change
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Solution
Solution
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Data Table
Data Table
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Sodium Bicarbonate
Sodium Bicarbonate
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Acetic Acid
Acetic Acid
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Citric Acid
Citric Acid
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Study Notes
- Learning Goal: MS-PS1-2 focuses on analyzing and interpreting data regarding substance properties before and after interaction to ascertain if a chemical reaction occurred.
- Students will be provided with background information on substances such as acetic acid, calcium chloride, sodium bicarbonate, citric acid, water, silver nitrate, potassium chloride, and sodium chloride.
- A data table will display the properties of each substance.
- A second data table will illustrate property changes when substances are mixed.
- Examples will include mixtures both with and without chemical reactions.
- Students must analyze the data to identify instances of chemical reactions.
- Students must support their conclusions with data and logical reasoning.
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